Add scrapers for Texas court data

[MorganBennetDev]

Adds scrapers to handle Texas court data along with a Scraper ABC, which future scrapers should inherit from. Uses TypedDicts to ensure output of Texas scrapers is always in the appropriate schema.

Resolves #1680

Changes

• Add Scraper ABC, which scrapers should inherit from, in order to help with type hints and ensure that all scrapers have necessary methods implemented.
• Add juriscraper.state submodule to organize Texas scrapers and future state scrapers.
• Add TexasSupremeCourtScraper, TexasCourtOfCriminalAppealsScraper, and TexasCourtOfAppealsScraper scrapers to handle their respective docket data, along with TypedDicts to define output schema for each scraper.
• Add TexasCommonScraper to contain extraction functionality common to all three courts.
• Add basic parse_table method to html_utils.py to simplify extraction of tabular data from HTML documents.